Method of and apparatus for recording data on write-once disc, method of and apparatus for reproducing data from write-once disc, and write-once disc therefor

ABSTRACT

A method and apparatus recording and/or reproducing data on/from a write-once disc, and a write-once disc therefor, the write-once disc having at least one recording layer including: a plurality of update areas in which predetermined updated information is recorded; and at least one access information area in which access information indicating an update area in which final recorded updated information is recorded. Reducing access time for reading the updated information using a location of predetermined updated information. Also, when a plurality of update areas for writing updated information required to use the write-once disc exist, a recording apparatus or a reproducing apparatus can quickly and easily determine an update area in which final updated information is recorded among the plurality of update areas.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.11/018,225, filed Dec. 22, 2004, now pending, which claims the priorityof Korean Patent Applications No. 2003-96223, filed on Dec. 24, 2003 andNo. 2004-6471, filed on Jan. 31, 2004, in the Korean IntellectualProperty Office, the disclosures of which are incorporated herein byreference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a method and apparatus recording and/orreproducing data on or from a write-once disc, and more particularly, toa method and apparatus recording access information on the write-oncedisc to access more quickly information required to use the write-oncedisc and a write-once disc used with the above method and apparatus.

2. Description of the Related Art

New information can be repeatedly recorded on a rewritable disc on whichinformation has already been recorded. However, when new information isrecorded on a write-once disc, since information that has already beenrecorded can be neither erased nor repeatedly recorded in a location inwhich the information was recorded, a new location must be allocated inorder to update the information already recorded.

Generally, only information which has finally been updated ismeaningful. Therefore, to read the information which has finally beenupdated, an update area is allocated to a data area, and a disc drivedetects the information which has finally been updated by searching forthe update area in which updated information is recorded. When muchinformation is recorded in the updated area, it takes a lot of time todetect desired information.

On a write-once disc for which defect management by a drive isperformed, areas to record information for managing defects generatedwhile the write-once disc is being used and information indicating arecording status of the write-once disc exist. Unlike a rewritable disc,according to a characteristic of the write-once disc, since updatedinformation cannot be repeatedly recorded in a location in whichexisting information has been recorded when an update of the defectmanagement information is required, the updated information must berecorded in an empty location. Accordingly, a relatively wide updatearea is necessary. In general, the update area is allocated to a lead-inarea or a lead-out area. However, sometimes, the update area may beallocated to a data area in order to increase an update count accordingto a user's designation.

When final updated information required to use the write-once disc isrecorded in the update area allocated to the data area, and wheninformation indicating that the update area is allocated to the dataarea and information indicating a location of the update area areincluded in the final updated information, the final updated informationor a location in which the final updated information is recorded cannotbe detected, even if the entire update area allocated to the lead-inarea or the lead-out area is sought.

SUMMARY OF THE INVENTION

According to an aspect of the present invention, there is provided awrite-once disc having recorded thereon information having a datastructure by which an access time for reading updated informationrequired to use the write-once disc can be reduced.

According to another aspect of the present invention, there is alsoprovided a data recording method and apparatus by which an access timefor reading updated information required to use a write-once disc can bereduced.

According to another aspect of the present invention, there is provideda data reproducing method and apparatus by which an access time forreading updated information required to use a write-once disc can bereduced.

According to an aspect of the present invention, there is provided awrite-once disc having at least one recording layer, the disc including:a plurality of update areas in which predetermined updated informationis recorded; and at least one access information area in which accessinformation is recorded, the access information indicating an updatearea in which final updated information is recorded.

According to another aspect of the present invention, there is provideda method of recording data on a write-once disc, the method including:recording predetermined updated information in one of a plurality ofupdate areas allocated to the write-once disc; and recording accessinformation indicating an update area in which final updated informationis recorded in at least one access information area allocated to thewrite-once disc.

According to another aspect of the present invention, there is providedan apparatus for recording data on a write-once disc, the apparatusincluding: a write/read unit writing or reading information on or fromthe write-once disc; and a controller controlling the write/read unit torecord predetermined updated information in one of a plurality of updateareas allocated to the write-once disc and record access informationindicating an update area in which final updated information is recordedin at least one access information area allocated to the write-oncedisc.

According to another aspect of the present invention, there is provideda method of reproducing a write-once disc, the method including:obtaining final updated access information from at least one accessinformation area allocated to the write-once disc; and obtaininginformation indicating an update area in which the final updated accessinformation is recorded among a plurality of update areas allocated tothe write-once disc from the final updated access information.

According to another aspect of the present invention, there is providedan apparatus for reproducing a write-once disc, the apparatus including:a reader reading data recorded on the write-once disc; and a controllercontrolling the reader to obtain final updated access information fromat least one access information area allocated to the write-once discand obtaining information indicating an update area in which the finalupdated access information is recorded among a plurality of update areasallocated to the write-once disc from the final updated accessinformation.

Additional aspects and/or advantages of the invention will be set forthin part in the description which follows and, in part, will be obviousfrom the description, or may be learned by practice of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects and advantages of the present invention willbecome more apparent and more readily appreciated from the followingdescription of the embodiments, taken in conjunction with theaccompanying drawings of which:

FIGS. 1A and 1B are structures of a write-once disc according to anembodiment of the present invention;

FIG. 2 is a detailed structure of a write-once disc having a singlerecording layer according to an embodiment of the present invention;

FIGS. 3A and 3B are detailed structures of a write-once disc having adouble recording layer according to an embodiment of the presentinvention;

FIGS. 4A and 4B are detailed structures of a write-once disc having adouble recording layer according to another embodiment of the presentinvention;

FIG. 5 illustrates a process of recording data in a user data area and aspare area according to an embodiment of the present invention;

FIG. 6 is a data structure of access information according to a firstembodiment of the present invention;

FIG. 7 is a data structure of access information according to a secondembodiment of the present invention;

FIG. 8 is a data structure of access information according to a thirdembodiment of the present invention;

FIG. 9 is a data structure of access information according to a fourthembodiment of the present invention;

FIG. 10 is a data structure obtained by dividing an entire TDMA into aplurality of virtual TDMAs;

FIG. 11 is a block diagram of a recording apparatus according to anembodiment of the present invention; and

FIG. 12 is a flowchart illustrating a recording method according to anembodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail to the embodiments of the presentinvention, examples of which are illustrated in the accompanyingdrawings, wherein like reference numerals refer to the like elementsthroughout. The embodiments are described below to explain the presentinvention by referring to the figures.

FIGS. 1A and 1B are structures of a write-once disc according to anembodiment of the present invention. FIG. 1A is a structure of awrite-once disc having a single recording layer, and FIG. 1B is astructure of a write-once disc having a double recording layer.

The write-once disc having a single recording layer includes a lead-inarea, a data area, and a lead-out area arranged from the innercircumference to the outer circumference.

Each of a first recording layer L0 and a second recording layer L1 ofthe write-once disc having a double recording layer includes a lead-inarea, a data area, and a lead-out area arranged from the innercircumference to the outer circumference.

FIG. 2 is a detailed structure of the write-once disc having a singlerecording layer according to an embodiment of the present invention.Referring to FIG. 2, the lead-in area includes a first disc managementarea (DMA1), a second disc management area (DMA2), a first temporarydisc management area (TDMA1), an access information area (AIA), and arecording condition test area. The lead-out area includes a third discmanagement area (DMA3) and a fourth disc management area (DMA4). Also,the lead-out area may further include at least one of a temporary defectmanagement area, a recording condition test area, and an AIA. That is,there may be at least one of the AIA, the DMA, the TDMA, and therecording condition test area in at least one of the lead-in areasand/or the lead-out areas.

FIGS. 3A and 3B are detailed structures of the write-once disc having adouble recording layer according to an embodiment of the presentinvention. FIG. 3A is a structure of a first recording layer L0, andFIG. 3B is a structure of a second recording layer L1. The structure ofthe first recording layer L0 shown in FIG. 3A is identical to thestructure of the write-once disc having a single recording layer shownin FIG. 2. The structure of the second recording layer L1 shown in FIG.3B is similar to the structure of the first recording layer L0. However,in the structure of the second recording layer L1, the AIA is notallocated to a second inner area, and two TDMAs are allocated to asecond data area.

The write-once disc having a double recording layer includes five TDMAs,a TDMA1 through a TDMA5. Locations and sizes of the TDMA1 and TDMA2 arewell known to recording apparatuses and/or reproducing apparatuses.However, a TDMA3, a TDMA4, and the TDMA5 are allocated to data areas bya user or a recording apparatus and/or a reproducing apparatus when adisc initialization is performed to use the write-once disc having adouble recording layer. When a temporary disc management structure(TDMS) is recorded from the TDMA1, a temporary disc defect structure(TDDS) including sizes and locations of TDMAs allocated to the dataareas is recorded in the TDMA1.

FIGS. 4A and 4B are detailed structures of the write-once disc having adouble recording layer according to another embodiment of the presentinvention. FIG. 4A is a structure of a first recording layer L0, andFIG. 4B is a structure of a second recording layer L1. A TDMA1, a TDMA2,and a TDMA5 are allocated to the write-once disc having a doublerecording layer shown in FIGS. 4A and 4B. That is, besides the wellknown TDMA1 and TDMA2, only the TDMA5 is allocated to a second data areaby a user or a recording apparatus and/or a reproducing apparatus when adisc initialization is performed to use the write-once disc having adouble recording layer.

Areas, such as TDMAs allocated to a write-once disc, and a process ofrecording data in the areas will now be described.

A TDMA is an area where TDMS for management of the write-once disc isrecorded before a finalization of the write-once disc. The finalizationof the write-once disc is an operation preventing the write-once discfrom being recorded again. When data cannot be recorded on thewrite-once disc any more by a selection of a user, or when data cannotadditionally be recorded on the write-once disc, the write-once disc isfinalized.

The TDMS includes a temporary defect list (TDFL), a TDDS, and a spacebit map (SBM). The TDFL includes information indicating an area in whicha defect is generated and information indicating a substitute area. TheTDDS manages the TDFL and includes a location pointer indicating alocation in which the TDFL is recorded, a location pointer indicating alocation in which the SBM is recorded, information indicating locationsand sizes of spare areas allocated to data areas, and informationindicating locations and sizes of TDMAs allocated to the data areas. TheSBM shows a data recording status of the write-once disc with a bit mapby allocating different bit values to clusters in which data is recordedin cluster units, which are data recording units, and clusters in whichdata is not recorded.

When the write-once disc is loaded into the recording apparatus and/orthe reproducing apparatus, a finally updated TDMS, in particular, theTDDS is quickly required to use the write-once disc in the apparatus.

Commonly, when the write-once disc is loaded into the recordingapparatus and/or the reproducing apparatus, the recording apparatusand/or the reproducing apparatus determines how to manage the write-oncedisc and how to record or reproduce data by reading information from thelead-in area and/or the lead-out area. If an amount of informationrecorded in the lead-in area and/or the lead-out area is large, moretime is taken to prepare recording or reproducing after the write-oncedisc is loaded. Therefore, the TDMS is used, and the TDMS generatedwhile data is recorded on or reproduced from the write-once disc isrecorded in the TDMA, which is separated from a defect management area,and allocated to the lead-in area and/or the lead-out area.

When the write-once disc is finalized, the TDMS, i.e., the TDFL and theTDDS, recorded in the TDMA is finally recorded in a DMA since aninformation access to quickly use the write-once disc is possible byallowing the recording or reproducing apparatus to read only meaningfulinformation from the defect management area by storing only finalmeaningful information among TDFLs and TDDs, which are updated andrecorded several times, in the DMA.

FIG. 5 illustrates a process of recording data in a user data area and aspare area according to an embodiment of the present invention.

Referring to FIG. 5, A indicates the user data area, and B indicates thespare area. A method of recording user data in the user data areaincludes a continuous recording mode and a random recording mode. Theuser data is recorded continuously and sequentially in the continuousrecording mode and randomly in the random recording mode. Zones {circlearound (1)} through {circle around (7)} indicate units in whichverification after recording is performed.

A recording apparatus writes the user data in zone {circle around (1)}and verifies whether the user data has normally been written or a defecthas been generated in zone {circle around (1)}. If a portion in whichthe defect has been generated is found, the portion is designated as adefect area, i.e., defect #1. Also, the recording apparatus rewrites theuser data, which has been written in the defect #1, in the spare area. Aportion in which the user data that has been written in the defect #1 isrewritten is called a substitute #1. The recording apparatus writes theuser data in the zone {circle around (2)} and verifies whether the userdata has normally been written or a defect has been generated in zone{circle around (2)}. If a portion in which the defect is generated isfound, the portion is designated as a defect area, i.e., defect #2.Likewise, a substitute #2 corresponding to the defect #2 is generated.Also, in zone {circle around (3)}, a defect #3 and a substitute #3 aregenerated. In zone {circle around (4)}, a defect area does not existsince a portion in which a defect has been generated is not found.

If an end of a recording operation #1 is predicted after the user datais written and verified, that is, if a user pushes an eject button, orif recording of the user data allocated to a recording operation isfinished, the recording apparatus writes information related to thedefect #1, and the defect #2, and the defect #3, which are defect areasgenerated in the zones {circle around (1)} through {circle around (4)},in the TDMA as a TDFL #1. Also, a management structure to manage theTDFL #1 is written in the TDMA as a TDDS #1. The recording operation isa work unit determined by an intention of the user or a desiredrecording work. In the present embodiment, the recording operationindicates a period from when the write-once disc is loaded and arecording work of predetermined information is performed to when thewrite-once disc is unloaded from the recording apparatus.

When the write-once disc is loaded again, a recording operation #2starts, a recording condition in the recording condition test area istested, and the user data is written on the basis of the test result.That is, in the recording operation #2, the user data is written inzones {circle around (5)} through {circle around (7)} in the same manneras recording operation #1, and a defect #4, a defect #5, a substitute#4, and a substitute #5 are generated. When the recording operation #2ends, the recording apparatus writes information related to the defect#4 and the defect #5 in the TDMA as a TDFL #2. Also, a managementstructure to manage the TDFL #2 is written in the TDMA as a TDDS #2.

As shown in FIGS. 2 through 4, when a plurality of TDMAs and spare areasare allocated to the write-once disc, the TDMAs and spare areas are usedin a predetermined order. For example, when a data write path applied tothe write-once disc having a double recording layer shown in FIG. 3 isan opposite track path, i.e., a path where data is recorded from a firstinner area of the first recording layer L0 to a first outer area of thefirst recording layer L0 and a second inner area of the second recordinglayer L1 to a second outer area of the second recording layer L1, datain the spare areas is recorded from a first spare area of the firstrecording layer L0. When the first spare area is full, a second sparearea, a third spare area, and a fourth spare area are used in thisorder.

Likewise, the TDMS is recorded from the TDMA1 of the first recordinglayer L0. When the TDMA1 is full, an updated TDMS is recorded in theTDMA2 allocated to the second inner area of the second recording layerL1. When the TDMA2 is full, a newly updated TDMS is recorded in theTDMA3 allocated to a first data area of the first recording layer L0. Inthe present embodiment, the TDMA1 and the TDMA2 allocated to the innerareas of the recording layers are preferred for the write-once disc.However, the TDMA(s) allocated to the data areas may be or may not beallocated by a selection of the user. Therefore, when the TDMAsallocated to the inner areas of the recording layers are full, the TDMAsallocated to the data areas are used.

When a final updated TDMS is written in a TDMA allocated to a data area,a write-once disc is unloaded, and the write-once disc is reloaded intoa recording apparatus, The recording apparatus must obtain the finalupdated TDMS to use the write-once disc. However, the TDMS is recordedin the TDMA allocated to the data area, and a disc drive cannotrecognize the fact that the TDMS is recorded in the TDMA allocated tothe data area until the disc drive accesses the TDDS included in theTDMS.

To solve this problem, an AIA is separately allocated to a predeterminedlocation of the write-once disc in the present invention. Accessinformation (AI) is recorded in the AIA. The AI indicates a locationwhere update information such as the TDMS is recorded.

Also, the update information indicates information that a recordingand/or reproducing apparatus must recognize to use a write-once disc inan initial period when the write-once disc is loaded into the recordingand/or reproducing apparatus. Also, an area in which the updateinformation is recorded is called an update area. In the presentembodiment, a representative update information is the TDMS, and arepresentative update area is the TDMA.

As shown in FIGS. 2 through 4, the AIA is preferably, but notnecessarily, allocated to a predetermined location of the lead-in areaor an inner area. Also, the size of the AIA is preferably, but notnecessarily, limited by minimizing an amount of AI recorded in the AIAand an AI update count since it takes longer to obtain the AI if thesize of the AIA is larger or a plurality of AIAs are allocated.

FIG. 6 is a data structure of access information (AI) according to afirst embodiment of the present invention. The AI shown in FIG. 6illustrates the TDMSs as update information, TDMAs as update areas, andthe AI in the write-once disc having a double recording layer shown inFIG. 3.

Referring to FIG. 6, an AI header includes an AI identifier indicatingthat the following data is the AI and an AI update count showing anupdate count of the AI.

The AI includes a total number of TDMAs allocated to a write-once disc,information indicating a TDMA in which a final TDDS is recorded, andinformation indicating locations of the TDMAs. Each TDMA locationinformation may include information indicating a beginning position andan ending position of each TDMA or information indicating a beginning orending position and the size of each TDMA. Since the TDDS includes apointer indicating a location of a corresponding TDFL, the AI includesinformation indicating the TDMA in which the final TDDS is recorded.

When a write-once disc according to the present invention is loaded intoa disc drive, the disc drive can recognize a TDMA in which a final TDDSis recorded by accessing an AIA in an already known location andobtaining final updated AI and obtain a final TDDS from the TDMA. Tominimize an access time to obtain the final AI recorded in the AIA, itis preferable, but not necessary, that AI is continuously recorded inthe AIA at the continuous recording mode and the AI update count isminimized.

According to an embodiment of the present invention, to minimize the AIupdate count, the AI is updated whenever the TDMA in which the finalTDDS is recorded is changed. Also, when information indicating thenumber of TDMAs allocated to the write-once disc and informationindicating locations of the TDMAs are included in the AI, the AI is alsoupdated when a new TDMA is allocated or the information indicatinglocations of the TDMAs is changed. Also, it is preferable, but notnecessary, that the same AI is repeatedly recorded to prepare for whenan error is generated in the recorded AI.

Since AI to be updated is continuously recorded after previous AI, evenif information indicating a detailed address at which a final TDDS isrecorded is not included in the AI, a recording apparatus and/or areproducing apparatus can quickly seek a location in which the finalTDDS is recorded by recognizing a border between a data recorded areaand a data non-recorded area using a track jump method since adifference exists between an RF signal obtained from the data recordedarea and an RF signal obtained from the data non-recorded area.

FIG. 7 is a data structure of AI according to a second embodiment of thepresent invention. The AI shown in FIG. 6 includes informationindicating locations of all TDMAs and information indicating a TDMA inwhich a final TDDS is recorded. However, the AI shown in FIG. 7 includesinformation indicating a location of a TDMA in which a final TDDS isrecorded. The information indicating the location of the TDMA in whichthe final TDDS is recorded can be represented as an address of a firstphysical sector of a first cluster of the TDMA and an address of a firstphysical sector of a last cluster of the TDMA. However, it will beunderstood by those of ordinary skill in the art that various changes inthe method of representing the information indicating the location ofthe TDMA in which the final TDDS is recorded may be made therein withoutdeparting from the spirit and scope of the present invention.

FIG. 8 is a data structure of AI according to a third embodiment of thepresent invention. The data structure of the AI shown in FIG. 8 isidentical to a data structure of a TDDS. That is, the TDDS is used asthe AI without defining a separate data structure of the AI. To use theTDDS as the AI, an information field indicating a location of a TDMA inwhich a final TDDS is recorded must be added to the TDDS.

FIG. 9 is a data structure of AI according to a fourth embodiment of thepresent invention. The data structure of the AI shown in FIG. 9 isidentical to a data structure of a TDDS as described in the thirdembodiment. However, unlike the third embodiment, a flag indicating alocation of a TDMA in which a final TDDS is recorded is further includedin the TDDS. In the present embodiment, the flag is made up of 8 bits, 5bits, b0 through b4, indicating the TDMA in which the final TDDS isrecorded and 3 bits, b5 through b7, being reserved bits. For example, itcan be defined that the final TDDS is recorded in the TDMA1 when b0trough b4 are “00001b”, the TDMA2 when b0 trough b4 are “00010b”, theTDMA3 when b0 trough b4 are “00100b”, the TDMA4 when b0 trough b4 are“01000b”, and the TDMA5 when b0 trough b4 are “10000b”.

The plurality of TDMAs allocated to the write-once disc according to thepresent embodiments are continuously used on the basis of a datarecording direction. Therefore, considering physically plural TDMAs asone consecutive TDMA, the one consecutive TDMA can be divided into aplurality of virtual TDMAs.

FIG. 10 is a data structure obtained by dividing an entire TDMA into aplurality of virtual TDMAs. For example, in the write-once disc having adouble recording layer, when the TDMAs are used in the order of theTDMA1, the TDMA2, the TDMA3, the TDMA4, and the TDMA5, and if each ofthe TDMA1 and the TDMA2 includes 2048 clusters, each of the TDMA3 andthe TDMA4 includes 4096 clusters, and the TDMA5 includes 8192 clusters,the entire TDMA includes 20480 clusters. If the entire TDMA is dividedinto 512-cluster units, 1024-cluster units, or 2048-cluster units, theentire TDMA can be divided into 40, 20, or 10 virtual TDMAs.

If the size of the TDMA3 among the TDMA1 through the TDMA5 allocated tothe write-once disc is very large, and if a final TDDS is recorded inthe TDMA3, a recording and/or reproducing apparatus recognizes the factthat the final TDDS is recorded in the TDMA3 from AI and obtains thefinal TDDS by seeking the TDMA3. However, when the size of the TDMA3 isvery large, it can take a long time to seek the TDMA3 in order to obtainthe final TDDS. Therefore, to solve this problem, a concept of thevirtual TDMAs described above is used. The size of each virtual TDMA canbe the same as shown in FIG. 10. However, the size of each virtual TDMAis not limited to the present embodiment.

The recording and/or reproducing apparatus divides the entire TDMA intothe plurality of virtual TDMAs and updates the AI when a virtual TDMA inwhich the final TDDS is recorded is changed. Each of the data structuresaccording to the first through fourth embodiments can be used as thedata structure of the AI according to the present embodiment. However,the AI of the present embodiment includes information indicating avirtual TDMA in which the final TDDS is recorded or informationindicating a location of the virtual TDMA in which the final TDDS isrecorded.

FIG. 11 is a block diagram of a recording apparatus according to anembodiment of the present invention.

Referring to FIG. 11, the recording apparatus includes a write/read unit1, a controller 2, and a memory 3. The write/read unit 1 writes data ona write-once disc 100 and reads the recorded data to verify whether adefect exists in the recorded data. An AIA according to the presentinvention is allocated to the write-once disc 100.

To manage the defect, the controller 2 uses a verify after write methodof detecting a portion in which a defect is generated by writing data inpredetermined units and verifying the recorded data. The controller 2checks where defects are generated by writing and verifying user data ineach recording operation unit, generates a defect list indicating wheredefect areas exist as the checking results, stores the generated defectlist in the memory 3, gathers a plurality of defect lists, stores theplurality of defect lists in an update area allocated to the write-oncedisc 100, i.e., a TDMA, as a TDFL, and further writes a TDDS formanaging the recorded TDFL in the TDMA. During one recording operation,a verify after write work is performed at least once, and commonly,several times. A defect list obtained by performing the verify afterwrite work is temporarily stored in the memory 3 as a TDFL. When therecording operation finishes, the controller 2 reads the TDFL stored inthe memory 3, provides the TDFL to the write/read unit 1, and commandsthe write/read unit 1 to write the TDFL in the TDMA allocated to thewrite-once disc 100.

When data cannot be recorded on the write-once disc 100 any more, orwhen a user does not desire to write data in a data area any more (whenthe write-once disc 100 is finalized), the controller 2 writes the TDFLand the TDDS recorded in the TDMA in a DMA allocated to the write-oncedisc 100.

The controller 2 controls the write/read unit 1 to write data having adata structure according to the present invention. That is, thecontroller 2 controls the write/read unit 1 to write predeterminedupdate information, i.e., a TDMS including a TDFL or a TDDS, in one of aplurality of update areas allocated to the write-once disc 100 and writeupdate AI in an AIA allocated to the write-once disc 100 when it isnecessary to update the AI.

A method of recording AI according to an aspect of the present inventionwill now be described in detail on the basis of the structure of therecording apparatus described above.

FIG. 12 is a flowchart illustrating a recording method according to anembodiment of the present invention.

When the write-once disc 100 is loaded into the recording apparatus, thecontroller 2 controls the write/read unit 1 to write predetermined userdata on the write-once disc 100 in operation 71.

It is determined whether information to be updated is generated as aresult of performing a verify after write work, which is performed atleast once during one recording operation in operation 73. In thepresent embodiment, the information to be updated indicates a TDMS. Whenthe TDMS is generated, the TDMS is temporarily stored in the memory 3,and when the recording operation is finished, the controller 2 reads aTDFL stored in the memory 3 and provides the TDFL to the write/read unit1, and the write/read unit 1 writes the TDFL in one of a plurality ofupdate areas allocated to the write-once disc 100 in operation 75. Inthe present embodiment, the update area indicates a TDMA.

The controller 2 determines whether another recording operation existsin operation 77, and if another recording operation exists, operations71 through 77 are repeated.

If another recording operation does not exist, the controller 2determines whether it is necessary to update AI in operation 79. In thepresent embodiment, when a TDMA in which a final TDMS, and in particulara final TDDS, is recorded is changed, when a new TDMA is allocated, orwhen information indicating a location of an existing TDMA is changed,the AI is updated.

The controller 2 controls the write/read unit 1 to write the AIindicating an update area in which final updated information is recordedamong a plurality of update areas in an AIA at least one of which isallocated to the write-once disc 100 in operation 81. It is preferable,but not necessary, that the same AI is repeatedly recorded in the eventan error is generated in the recorded AI.

As described above, if AI indicating a location in which a final TDMS isrecorded is recorded in an AIA of the write-once disc 100, when thewrite-once disc 100 is loaded into a recording apparatus or areproducing apparatus again, the recording apparatus or the reproducingapparatus can access a final TDDS more quickly and easily.

An apparatus (not shown) for reproducing the write-once disc 100including an AIA in which AI according to the present invention isrecorded has a similar structure to the recording apparatus shown inFIG. 11. However, since it is a reproducing apparatus, a reader isincluded instead of the write/read unit 1. When the write-once disc 100including the AIA in which the AI is recorded, is loaded into thereproducing apparatus, the reproducing apparatus determines whether thewrite-once disc 100 is finalized by accessing a DMA and determiningwhether data is recorded in the DMA. If the write-once disc 100 is notfinalized, the reproducing apparatus accesses the AIA and obtains finalAI. The recording apparatus or the reproducing apparatus recognizes theTDMA in which the final TDDS is recorded from the final AI. Operationsof the reproducing apparatus according to the present invention can beeasily understood by those skilled in the art from the description ofthe write-once disc 100 including the AIA and the recording apparatustherefor.

If the write-once disc 100 is a blank disc which is not initialized,data is not recorded in the AIA at all. The recording apparatus performsinitialization to use the write-once disc 100. When the write-once disc100 is initialized, first AI having a data structure according tovarious embodiments as described above is recorded in a first recordingcluster of the AIA

As described above, according to an embodiment of the present invention,an access time for reading updated information can be reduced when awrite-once disc on which predetermined information is updated andrecorded in a new location is used. Also, when a plurality of updateareas for writing updated information required to use the write-oncedisc exist, a recording apparatus or a reproducing apparatus can quicklyand easily determine an update area in which finally updated informationis recorded among the plurality of update areas.

Although a few embodiments of the present invention have been shown anddescribed, it would be appreciated by those skilled in the art thatchanges may be made in these embodiments without departing from theprinciples and spirit of the invention, the scope of which is defined inthe claims and their equivalents.

1. A method of recording data on a write-once disc, the methodcomprising: recording temporary defect list (TDFL) and temporary discdefect structure (TDDS) in a plurality of temporary defect managementareas allocated to the write-once disc, the temporary defect listcomprising information on defect areas, and the temporary disc defectstructure comprising a location pointer indicating a location in whichthe temporary defect list is recorded; and recording access informationin at least one access information area allocated to the write-oncedisc, the access information indicating a temporary defect managementarea in which latest temporary defect list and temporary disc defectstructure are recorded, among the plurality of temporary defectmanagement areas, wherein the access information is updated in theaccess information area when the temporary defect management area inwhich the latest temporary defect list and temporary disc defectstructure are recorded, is changed.
 2. The method of claim 1, whereinthe access information includes at least one of the plurality oftemporary defect management areas or information indicating locations ofthe at least one of the plurality of temporary defect management areas.3. The method of claim 2, wherein the information indicating locationsof the at least one of the plurality of temporary defect managementareas includes a beginning position and an ending position of eachtemporary defect management area.
 4. The method of claim 2, wherein theinformation indicating locations of the at least one of the plurality oftemporary defect management areas includes a beginning position and asize of each temporary defect management area.
 5. The method of claim 2,wherein the information indicating the locations of the at least one ofthe plurality of temporary defect management areas includes an endingposition and a size of each temporary defect management area.
 6. Themethod of claim 1, wherein the recording of the access informationcomprises: recording updated access information indicating a changedtemporary defect management area only when one of the plurality oftemporary defect management areas, in which the latest temporary defectlist and temporary disc defect structure is recorded, is changed.
 7. Themethod of claim 2, wherein the recording of the access informationcomprises: recording the access information including the at least oneof the temporary defect management areas changed or the informationindicating the location of an added temporary defect management areawhen a new temporary defect management area is added to the write-oncedisc.
 8. The method of claim 2, wherein the recording of the accessinformation comprises: recording the access information including theinformation indicating a changed location when information indicatingthe location of the at least one of the plurality of temporary defectmanagement areas is changed.
 9. The method of claim 1, wherein therecording of the access information comprises: repeatedly recording theaccess information in the access information area.
 10. The method ofclaim 1, wherein the access information is a flag indicating thetemporary defect management area in which the latest temporary defectlist and temporary disc defect structure is recorded.
 11. The method ofclaim 1, wherein the plurality of temporary defect management areas arephysical areas.
 12. The method of claim 1, wherein the plurality oftemporary defect management areas are obtained by logically dividing aplurality of physical areas.
 13. The method of claim 1, wherein thewrite-once disc has a single recording layer including a lead-in area, adata area, and a lead-out area, and at least one access information areais allocated to the lead-in area or the lead-out area.
 14. The method ofclaim 1, wherein the write-once disc has a double recording layer, eachrecording layer including an inner area, a data area, and an outer area,and at least one access information area is allocated to the inner areasor the outer areas.
 15. A method of reproducing a write-once disccomprising a plurality of temporary defect management areas in whichtemporary defect list (TDFL) and temporary disc defect structure (TDDS)are recorded, the method comprising: obtaining access information fromat least one access information area allocated to the write-once disc,the access information indicating an temporary defect management area inwhich latest temporary defect list and temporary disc defect structureare recorded, among a plurality of temporary defect management areas;and obtaining the latest temporary defect list and temporary disc defectstructure based on the access information, the temporary defect listcomprising information on defect areas, and the temporary disc defectstructure comprising a location pointer indicating a location in whichthe temporary defect list is recorded, wherein the access information isupdated in the access information area when the temporary defectmanagement area in which the latest temporary defect list and temporarydisc defect structure are recorded, is changed.
 16. The method of claim15, wherein the access information includes the plurality of temporarydefect management areas.
 17. The method of claim 15, wherein the accessinformation includes information indicating a location of the temporarydefect management area in which the latest temporary defect list andtemporary disc defect structure is recorded.
 18. The method of claim 17,wherein the information indicating the location of the temporary defectmanagement area in which the latest temporary defect list and temporarydisc defect structure is recorded includes a beginning position and anending position of the temporary defect management area.
 19. The methodof claim 15, wherein the plurality of temporary defect management areasare physical areas.
 20. The method of claim 15, wherein the plurality oftemporary defect management areas are obtained by logically dividing aplurality of physical areas.